Plug cock



Nov. 8, 1949 F. R. GQEHRING l 2,487,436

PLUG oocx Filed June 2l, 1945 n 20 FLL. .22 wvl/#1:!" 23 4'? g Fi` 2 Patented Nov. 8, 1949 Francis-RudolphGoehrng; Philadelphia, Emana. signor, by mesne assignments, toL Minneapolis?L Honeywell Regulator Comnany; Minneannlis.. Minn-monoporetion ofDelawar.o1

Application June 21, 1945, serial No. y600,658.-

a-oiaims (crash-103 ThisV invention relates to plug cocks;` and1 it relates-more particularly tothe construction and arrangement' of plug cocksy of the larger sizes; andi, to'. those which are. usedI forY the control' of liquidmaterialsl asttowhich leakage at the ends ofthe plugs' would be more than ordinarilysobj ectionable;

Heretofore; the most common.form.of plugV cock comrnisedfa'A casing,l having means for mounting thelsamein avk pipeline, andfprovid'edl with-1 a ro.- tatable'tapered'. plug having acentralport forrthe passage yt'lierethrougir of the: material" to be con trolled; Insuclr construction, thejtaper of the plugy isidependedf--upon y to'A prevent leakaga. ands in some instances the plugs-are spring loadedlmto enhancethe eiioiency,- of tlie engagementofthe contacting surfaces ofthe-plug andthe-casing;

However, in the-largery sizesoff plug: cocks; if the taper, and the spring. loading-When: used, are such4 as to' prevent leakage at theends` of the plug', the friction isnecessarily'quite largeand the" rotation of theplug in the casing is very. dif-- fcult'.v

'Ilhef prin'cipalobject off the inventionisztoprovide-a plug cock which is sofconstructed and ar.- ranged as lao-permit the plug'tobe rotated; easily and? Without-undue. resistance, andi at the same time' to provide-1a vconstruction in Whicnleakage at thelends of' theplug is prevented;

With the foregoing object inview; my. inventionVv contemplatesA the provision-y of'l a plug oook inwhi'ch the plugA iswithout taper,v thatis tousay, the operating portion thereof: is; of: ay straight cylindricall form but the same providedf 'with compression springs: arranged' and; operating-:n

a plug cock embodying the maineatunes of the present invention, portions thereof being shown in elevation; and Fig,.2 is a horizontal seetion taken approxi?- linately.' on. the line.. 2--2 of *Figur-e: 1.

It should, of course, be understood that the description andi drawing: herein are illustrative merely, and that various, changes and modia.- tions. may be made in. the structure; disclosed without' departing from'the spirit of the inven tion.

Referring to tlie'-drawing;I isthebodymasing which, byf-reason, oaf.-l the irwention.y being.,l paltton-.e larlyfapplieablelfor the larger sizesof plngoocksf, is-1 shownas:Y provided' with. anges, 6 for-connecte ing. the cock. in.. theV pipe linev Where thesam,.-i$ to be used; @ff course. if: the device, should. .be made in the smallersizes: the usual@ internally threaded ends-ffox-fthe.pipe;y connections, wouldzbe provided instead of the flanges.

The bodyhastheausual .passageway 'lr extending therethrough. The `plugs 8: comprises` mmemv ber having its mainv operating; portion; ofc a. straight cylindrical, formi with. av central. porti 9 passingtheretnrough; and: adapted; to.- register withthe passageway '1f in. thehody. 5; Theplug Si is reduced in diameter asiat-Im atzits uppenend to provide. shoulder Irll whichy eo-actsz 'with .an internal? ledge. l2" provided inl the. body: 5. at: the place vwhere the; reduced portion'. .me of; the plug; 8 extends z through the'fbod'y' 5 v Interposed between: the shoulder H1. and. the ledge l2 is an annular gasket'. 13,.off anyfsuitahle packingfmaterialzpreferably ofi'a semi-hard'charenter which,A When-l compressed in the manner to] be hereinafter seti forth', will: serve electively to L prevent leakage at:- lana-trenntI of: the plug. The protruding7 portion; of; theplugrmemben- Bfmay. be squared; asY at M; to.; enable: thev plugftoy loev ro'- tated: to open or` close :the coole The' other.- endi of: the plug 8f isf also reduced inl diameter;` as at laandgissoshapedas to pro* vide .an inclinadashoulderl 1.65 which@ registers with a. similarly.I inclined; shoulder: 421- in an. annular recess. win the-zbody orcasng 5; The. reduced portion l5. of;v thea. plug Sand: thefrecessv I8, together servetolproyidean: annular -spacain which packing I9 is disposed;

The packing. I9.; is held; intV place'. and is; compressedlbyrmeans otan-annulusi-2llfhaying a por tion; 2l? which, extends into;` the' annular spaee abovedescribedz. The. 211111111115129 lis .provided'with aseat 22 for one end of; a. coil; spring 23;. The othen'end of theeonillspring:Zlisnseated adisc member .21; The disc: member 24: is engaged: by the roundedinner: endz off a; threemisaol bushing 25 which is; mounted? inzaz. complementallythreaded portion. 26, ofIl a yoke.; member' 21;. which isbolted to'a. suitable; angei 28.: providednim theabodyporr- .tion '5i of the. cocie- The. bushing` 25.; whichy is threaded in; theL yoke-l. 2,7-,v serves; as a. means: for reguatinathe tension-off thelcoll spring.; 23awhiola The; hoshimi 2511s; also. bored; centrally amr` is 29, the inner end of which is preferably pointed, as at 30, and bears against a recess 3I in a disc member 32. The disc member 32 serves as a seat for one end of a coil spring 33, the other end of which bears against a similar disc member 34. The disc member 34 is provided with a central teat 35 which is seated in a suitable depression 36 in the lower end of the plug 8. The lower end of the plug may also be recessed as at 31 for the location therein of the disc member 34 in which the upper end of the coil spring 33 is seated. The coil spring 33 serves as a means for compressing the packing I3 independently of the compression of the packing I9 by the coil spring 23. The coil spring 33 is concentrically disposed in the interior of the coil spring 23, thus reducing the overall height of the device.

It will be seen that by the foregoing arrangement the compression of the packing I3 may be readily adjusted by the bolt 29, that said adjustment may be made independently of the adjustment of the compression of the packing I9 which is effected by the adjustment of the threaded bushing 25. By this arrangement leakage at the respective ends of the plug may be readily eliminated, and this without unduly increasing the friction which would interfere with the free actuation of the plug to open and close the cock.

I claim:

1. A plug cock comprising a body having a of said plug in engagement therewith, separate springs at one end of the plug, one of said springs being directly effective for compressing one of said packings and the other of said springs being veffective on said plug for urging said plug into engagement with the other of said packings, and

means for varying the tension of said springs independently of each other.

2. A plug cock comprising a body having a passageway extending therethrough, a straight cylindrical plug member rotatably mounted therein and having a port adapted to register with the passageway in the body, one end of said plug member being reduced in diameter to provide a shoulder, a coacting ledge in the body portion, packing interposed between said shoulder and said ledge, packing at the other end of said plug, a coil spring for compressing said packing, means for varying the tension of said spring, a second spring impelling the plug to compress the first mentioned packing, and means for varying the tension of said spring independently of the tension of the rst mentioned spring.

3. A plug cock comprising a body having a passageway extending therethrough, a straight cylindrical plug member rotatably mounted therein and having a port adapted to register with the passageway in the body, one end of said plug member being reduced in diameter to provide a shoulder, a coacting ledge in the body portion, packing interposed between said shoulder and said ledge, packing disposed at the other end of the plug member in engagement with said body and said plug member, an annular member bearing against said packing to compress the same, a spring bearing against said annular member, means for varying the tension of said spring, a second spring impelling the plug to compress the rst mentioned packing, and means for varying the tension of said spring independently of the tension ofthe rst mentioned spring.

4. A plug cock comprising a body having a passageway extending therethrough, a straight cylindrical plug member rotatably mounted therein and having a port adapted to register with the passageway in the body, one end of said plug member being reduced in diameter to provide a shoulder, a coacting ledge in the body portion, packing interposed between said shoulder and said ledge, the other end of said plug being reduced in diameter and the body being complementally recessed to provide an annular space, packing disposed in said annular space, an annular member bearing against said packing to compress the same, a spring bearing against said annular member, means for varying the tension of said spring, a second spring impelling the plug to compress the first mentioned packing, and means for varying the tension of said spring independently of the tension of the rst mentioned spring.

5. A plug cock comprising a body having a passageway extending therethrough, a straight cylindrical plug member rotatably mounted therein and having a port adapted to register with the passageway in the body, one end of said plug member being provided with a shoulder, a coacting ledge in the body portion, packing interposed between said shoulder and said ledge, the body at the other end of the plug being recessed to pro- Vide an annular space, packing disposed in said annular space in engagement with the periphery of the plug, an annular member bearing against said packing to compress the same, a spring bearing against said annular member, means for varying the tension of said spring, a second spring impelling the plug to compress the rst mentioned packing, and means for varying the tension of said spring independently of the tension of the first mentioned spring.

6. A plug cock comprising a body having a passageway extending therethrough, a straight cylindrical plug member rotatably mounted therein and having a port adapted to register with the passageway `in the body, one vend of said plug member being provided with a shoulder, a coacting ledge in the body portion, packing interposed between said shoulder and said ledge, the body at the other end of the plug being recessed to provide an annular space, packing disposed in said annular space in engagement with the periphery of the plug, an annular member bearing against said packing to compress the same, a spring bearing against said annular member, means for varying the tension of said spring, a second spring concentricallydisposed with respect t0 said rst spring impelling the plug to compress the first mentioned packing, and means for varying the tension of said spring independently of the tension of the first mentioned spring.

FRANCIS RUDOLPH GOEHRING.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,012,427 Haun Aug. 27, 1935 FOREIGN PATENTS Number Country Date 183,204 Great Britain of 1921 

